Flujo de partículas en la Fosa de Cariaco, resultados de dos decadas de observaciones 1995 – 2016

TitleFlujo de partículas en la Fosa de Cariaco, resultados de dos decadas de observaciones 1995 – 2016
Publication TypeJournal Article
Year of Publication2020
AuthorsOjeda P, Varela R, Thunell R, Muller-Karger F, Tappa E
JournalMemoria de la Fundación La Salle de Ciencias Naturales
Start Page65
Date Published12/2020
Type of Articleresearch

The particles in the sea have an organic or inorganic origin, and sediment towards deep waters and the bottom; factor that maintains life in the dark ocean and process that sequesters C from the hydrosphere and atmosphere. In the Cariaco Basin site with high biological productivity and deep anoxic waters, an array of sediment traps was maintained for 20 years. The results of the particle flux between 225 to 1210 m depth were updated, measuring the basic components, organic C, N, opal (biogenic silica), carbonates (CaCO3) and terrigenous (fraction of lithogenic origin). The flux was related to the climatic and hydrographic conditions. The variations were notable, both seasonal and long-term. Although the total flux did not show significant trends in the time series, the proportions of the organic carbon (Corg,), nitrogen (N) and opal components decreased over time, while calcium carbonate (CaCO3) and terrigenous materials increased, reflecting changes in the composition of phytoplankton as the bulk origin of organic matter. There was a general positive correlation of Corg, N, and opal flux with primary production and chlorophyll at the surface, although in the upwelling season there was no correlation due to a higher recycling rate of organic matter. Zooplankton had influence on transport to anoxic deep water. Near the bottom in Cariaco comes a flux of particulate matter of 9.32 ± 5.47 g m-2 month-1 of which 0.82 ± 0.35 g m-2 month-1 is Corg, which represents 2.37% ± 1% of the C fixed on the surface.

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